Side-slipping movable-plunger weft detector



JuneV 24, 1930.

E. R. HoLMn-:s 1,766,821

snm sLIPPING MovABLE PLUNGER wEFT DETEGTQR Filed Nov. 1e. 1927' z5' ffy @7 y Y fa .35 v

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Patented `lune 24, 1930 UNITED STATES PATENT oFFicE ELBRIDGE R. `HOLMES, OF WORCESTER, MASSACHUSETTS, ASSIGNOR TO CROMPTO 6'5 KNOWLES LOOM WORKS, OF WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS SIDE-SLIPPING MOVABLE-PLUNGER WEET -DETECTOR Application led November 16, 1927. Serial No. 233,711.

This invention relates to improvements in side slipping weft detectors and it is the general object of the invention to provide ready means for rendering the detector suitable for use on varying types of yarn, the detector employing a plurality of plungers mounted on a pivoted carrier and so arranged that angular movement of the carrier will effect a change in the operation of the loom, the plungers yielding independently of each other to conform to the -shape of the wound mass of yarn being detected.

It is a further object of my invention to provide a detector plunger carrier having provision for receiving a group of detector plungers the position of which may be varied with respect to the pivoted carrier so that the group may occupy several positions relatively to the center about which the pivoted carrier swings.

It is a further object of my present invention to provide a pivoted carrier for a plurality of yielding detectors so related to the transferrer mechanism of the loom that at the time of transfer the pivoted carrier will be engaged directly to be moved forwardly for the purpose of carrying the detector out of the path of the incoming bobbin.

With these and other objects in view which will appear as the description proceeds, my invention resides in the combination and arrangement of parts hereinafter.

described and set forth in the claims.

In the accompanying drawings wherein one form of my invention is shown,

Fig. 1 is a top plan view of a detector made according to my present invention in non-indicating position, certain parts being shown in section,

Fig. 2 is a side elevation taken in the direction of arrow 2,Fig. 1, the bobbin and rear ends of the detector plunger being omitted, y

Fig. 3 is a view similar to Fig. 1 but with the detector in indicating position,

Figs. 4 and 5 are detailed vertical sections on lines 1 -4 and .5 5, respectively, of Fig. 1, and

a` controller pin 12 to effect change in the operation of the loom. The rear end of said pin 12 is received by a guide slot 13 in stand 10 extending transversely of and below the normal raised position of the actuator lever 1l, while the forward end of the controller pin issupported by `a bracket 111 secured to thestand 10. Under normal conditions the actuator lever 11 is givena periodic downward movement on each detecting beat of the loom and when suiii cient weft is present the controller pin 12 will be out of the path of the lever, but when insufficient weft is present said pin will bermoved vunder the lever 11 to interrupt its down motion and thereby initiate a change in the operation of the loom. Thetransferrer arm 15 may be pivoted to a fixed stud 16 and have an angular movement around saidstud at the time of weft replenishment so that the depending arms 17 will move to the left as viewed in Fig. 2. The matter thus far described is of common construction and forms no part of my present invention. i

In carrying my improvements into effect I provide a'feeler bed 20 fast with the stand 10 and form in said bed a horizontal dove tailed slot 21 extending forwardly from the shuttle S. A feeler slide 22 having the lower portion formed t'o enter the slot 21 is slidably mounted on the bed and is limited as to its rearward movement by a pin 23 secured to the bed 20 and extending upwardly into the path of the slide 22. A tension spring 24: has the rear end thereof held `by the pin 23 and the yforward end held by pin 25 secured to the slide so that the latter will be held yieldingly in rearward position. Y

TheV means for mounting the detecting element includes a vertical pin 26 secured to the slide and affording pivotal support for a carrier 28. Said carrier as shown in Fig. 2 is formed with a substantially iiat bottom portion 29 having a forward upwardly extending portion 30 the end of which is bent horizontally as at 31 to eX- tend parallel to and above the portion 29; rilie stud 26 extends through the horizontal portions 29 and 31 and has lying therearoun-da torsion spring 32 one end of which entends through the stud and the other end of which engages the carrier, the normal effect of said torsion spring being to hold the carrier in the position shown in Fig. l

with the part 29 heldagainst the pin 25..-

ISaid pivoted carrier has an upwardly projecting arm, 33 whichprojects, to the left and is; reduced-to pass through a slot 34 formed ini the controller pin. 12..

The detecting element includes a plurality of yielding plungers 35, each provided .vitha shoulder 36 and a pointed yarn enF gai-.ging rear end 37. rlhcse plungers. are. mounted in a pressed metal casing. 38 which is secured in anyV approvedinanner to. the, pivoted carrier- 28, asby riveting indicated aty 39 in Fig. 2'. Said casing has a rear vertically extending. wall 40 provided with a plurali-ty of plunger receiving openings. 4l as indicated in. Fig. 4,. saidopenings being of substantially the same. size as the wire of which the plungersv are made and serving to preventiateral and vertical displacement of said;detectors.'` Thev forward end of the casing has an` upwardly extending portion 42 the extreme upper end of' which is curved rearwardly to provide anvv overhang 43. The portion 42 provided witlr a plurality of vertical slots 44 as shown. in Fig,V 5, there being one slot for each of thel openings 4l. Each plunger is surrounded by a compression spring 45 which lies between the shouldery 36 ofthey corresponding. plunger and the vertical portion 42. The overhang 43 of the casing servesv to prevent upward displacement of the springv and therefore prevents improper position:- ing of the detector elements with respect toJ the casing,

lVhen suflicient yarn isfpresent on bobbin'` B all of said plungers will be moved forwardly and the carrier 28 together with, its, sliding support will remain at rest, 'the controller pin being normally out of the path;

ofthe actuator lever so that the latterymayVv descend without1 interruption.` Then insufficient weft for continued weaving. is pres-A ont, however, the detectors will slide along the bobbin to assume a position similar to that shown in Fig. 3, this action being accompaniedyby ay pivotal` movement of the carrier 28 and the corresponding rearwardv movement of the controller pin l2,.they latter being thereby placed under the actuator lever to initiate a change` in. the operation` of the leoni. Fig. l indicatesthat the plungers cooperate with a conical formation of yarn to prevent premature indication of weft exhaustion. A single plunger in engagement with the yarn will prevent the carrier 28 from having a pivotal movement.

Figs. l, 31 and 6 indicate the manner in which the detectors may be adjusted relatively to the carrier to vary the resistance toj sliding movement of the plungers along different kinds of yarn. As' show nherein the casing has provision fory receiving plungersin six different positions but four plungers will ordinarily be suficient for all delect-ingcondi-tions` As'shown in Figs. l and 3 the plungers are groupedin a position nearest the stud 26 sogth-at there isl least o-ii-l set of the detecting surface relatively to the anis. of the4 carrier 28, such a relation of the pantsbeinff desirablewhen detecting the very hard ne yarn having a relatively low coefiicient of friction. with; the detecting sur'- face. When a coarseiror softer yarn' isuscd which may bey more readily penetrated by the plungers the latter will beinoved to the right to thev position. indicated in Fig.r 6 so that they detecting surface will' be offset a:

greateizamount from the pivot around which has been removed from: the. corresponding' hole 4l. By areverseoperation: the plunger maybe inserted inra new hole' 4'1 and slotv 44..

At.- the; time of transfer the downwardly` extending arm 17 willy be moved forwardly into engagement with the arm 33` and the-y detectorsswillV therefore be moved forwardly out, ofthe patli of theincoming'bobbin, pini 25 arresting left hand movement from'. the

pivoted carrier 28 to require the latteivto move the slide 22; forwardly-against the action of spring 24.. ThisY latter' spring is sufficiently strong te'Y withstand thel forces exerted .by the several!'compression springs 45 surrounding the plunger detectors and is intended toY expand'only at the-time of transfer. i

From theV foregoing it will be secngthat I have .provided aj simple weft: detector cm,-l ploying; a pluralityof plungersal'll or" vhich.

slide in lines passing to one sideof the pivot ofthecarrier 23 soA that the latter will' be moviedgangularlyat the timel of indication,

said detectors: cooperating. with. variousv contours of yarn to prevent prematureindi.- cation., ln this connection the plungersai'e movable to assumedifferent: positions with; respect tothe pivot of the carrier, thus enablingthe detector to be used inconnection with various types of yarn. Itwilll further be seen that the transferrer arm has direct contact with the portion of the angularly moving carrier 28 and moves the latter forwardly independently of the sliding support 22. It will also be seen that the individual plunger detectors are readily removable and are normally held in position by reason of the fact that the overhanging portion 43 engages the springs to prevent upward movement of the plungers.

Having thus described my invention it will be seen that changes and modifications may be made therein by those skilled in the art without departing from the spirit and scope of the invention and I do not wish to be limited to the details herein disclosed, but what I claim is:

l. In a side slipping weft detector mechanism for looms, a carrier member normally stationary and out of contact with the surface at detection and movable about a normally fixed center, a group of substantially parallel yielding plungers having weft engaging portions, and means to support said group of plungers on the normally stationary member in a plurality of diiferent positions along the length of the surface being detected and relatively to the center of the carrier.

2. In a side slipping weft detector mechanism for looms, a carrier member normally stationary and out of contact with the surface at detection, means dening a normally xed pivot around which the carrier may move, a group of yarn engaging yielding substantially parallel detector plungers, and means supported by the carrier member to hold said group of detector plungers in a plurality of different positions relatively to the pivot for the carrier member and with respect to the length of the surface being detected.

3. In a side slipping weft detector mechanism for looms, a carrier member normally stationary and out of contact with the surface at detection, means dening a pivot about which the carrier may swing, a group of detector plungers, guide means on the carrier member including a plurality of pairs of aligned openings to receive the plungers and hold the same in substantially parallel relationship, there being a greater number of pairs of aligned openings than there are detectors and the group of plungers being movable to different positions relatively to the carrier to assume a plurality of positions relatively to the pivot of the carrier.

4;. In a weft detector mechanism comprising a fixed stand, a slide, a swinging detector carrier and a pivotal connection between the' slide and the pivoted carrier, a casing supported by the pivoted carrier and having aforward extension terminating in a rearwardly projecting overhang, there being a series of parallel slots in the aforesaid projection and overhang, a plurality of plungers mounted in the casing for forward movement relatively thereto, said plungers all moving in lines passing to one side of the pivotal connection between the carrier and the slide, and compression springs surrounding said plungers tending to hold the latter yieldingly in rear position, said springs eX- tending under the overhanging portion of the casing to prevent accidental upward movement of the detector plungers in the aforesaid slots.

5. In a weft detector mechanism comprising a fixed stand, a slide, a swinging detector carrier and a pivotal connection between the slide and the pivoted carrier, a resilient device to hold the slide normally in rear position, a second resilient element to resist angular motion of the carriery around its pivotal connection with the slide, a plurality of substantially parallel yarn engaging vdetecting plungers mounted on the pivoted carrier, individual spring means for each plunger, said spring means normally holding the plungers in rearward position, said iirst named resilient device for the slide being stronger than the total force exerted by all of the spring means operatively related to the plunger detectors, and said second namedresilient element being weaker than the total force exerted by the plunger spring means, whereby said slide will normally be held against forward movement but will yield angularly as the detector plungers move along a depleted bobbin.

In testimony whereof I have hereunto ailixed my signature.

ELBRIDGE R. HOLMES. 

